package cn.ly.domain.strategy.service.rule.chain.factory;

import cn.ly.domain.strategy.model.entity.StrategyEntity;
import cn.ly.domain.strategy.repository.IStrategyRepository;
import cn.ly.domain.strategy.service.rule.chain.ILogicChain;
import lombok.*;
import org.apache.commons.lang3.ArrayUtils;
import org.springframework.stereotype.Service;

import java.util.Map;

/**
 * 责任链工厂
 */
@Service
public class DefaultChainFactory {

    private final Map<String, ILogicChain> logicChainGroup;
    protected IStrategyRepository repository;

    public DefaultChainFactory(Map<String, ILogicChain> logicChainGroup, IStrategyRepository repository) {
        this.logicChainGroup = logicChainGroup;
        this.repository = repository;
    }

    /**
     * 通过策略ID，构建责任链
     *
     * @param strategyId 策略ID
     * @return LogicChain
     */
    public ILogicChain openLogicChain(Long strategyId) {
        StrategyEntity strategy = repository.queryStrategyEntityByStrategyId(strategyId);
        String[] ruledModels = strategy.ruleModels();
        // 如果未配置策略规则，则只装填一个默认责任链
        if (ArrayUtils.isEmpty(ruledModels)) {
            return logicChainGroup.get(LogicModel.RULE_DEFAULT.getCode());
        }
        // 按照配置顺序装填用户配置的责任链；rule_blacklist、rule_weight 「注意此数据从Redis缓存中获取，如果更新库表，记得在测试阶段手动处理缓存
        ILogicChain logicChain = logicChainGroup.get(ruledModels[0]);
        ILogicChain current = logicChain;
        for (int i = 1; i < ruledModels.length; i++) {
            ILogicChain next = logicChainGroup.get(ruledModels[i]);
            current = current.appendNext(next);
        }
        // 责任链的最后装填默认责任链
        // 责任链的最后装填默认责任链
        current.appendNext(logicChainGroup.get(LogicModel.RULE_DEFAULT.getCode()));
        return logicChain;
    }

    @Data
    @Builder
    @AllArgsConstructor
    @NoArgsConstructor
    public static class StrategyAwardVO {
        /** 抽奖奖品ID - 内部流转使用 */
        private Integer awardId;
        /**
         * 抽奖类型；黑名单抽奖、权重规则、默认抽奖
         */
        private String logicModel;
        /**
         * 抽奖奖品规则
         */
        private String awardRuleValue;
    }

    @Getter
    @AllArgsConstructor
    public enum LogicModel {

        RULE_DEFAULT("rule_default", "默认抽奖"),
        RULE_BLACKLIST("rule_blacklist", "黑名单抽奖"),
        RULE_WEIGHT("rule_weight", "权重规则"),
        ;

        private final String code;
        private final String info;

    }
}
